Best Replacement Windows

Check out our selections for the best fiberglass windows from many of the most popular manufacturers and window makers, including Marvin, Milgard, Inline and more.

Marvin Infinity Window

The Marvin Infinity is the higher end Marvin fiberglass window that is widely regarded as one of the best fiberglass windows available. The Infinity offers more options, a better looking frame, more sizing options, and better hardware than the Integrity model. The Infinity comes with a fiberglass exterior and an interior option of either the Ultrex or a wood veneer called their EverWood that resembles the look of wood but does not require the maintenance that a real wood species does. The performance numbers on the Infinity are really not that impressive, although an upgrade to one of their better glass packages can improve the numbers substantially.

Marvin Integrity Window

The Marvin Integrity Series comes in two options, either in a full Ultrex fiberglass frame on both the inside and the outside or the Ultrex exterior with a real wood interior option. This is a great option for consumers who want the wood interior, but still want the strength of the fiberglass exterior.

The Integrity comes with Cardinal Glass, which is a well-regarded glass company. The Integrity lacks some of the nicer options of the Infinity model, although it also runs about $75 less per window then it's Infinity counterpart. Homeowners can expect less sizing options, a thinner frame, less color and interior finish options, as well as a bit less in terms of the overall aesthetics of the window.

Milgard Ultra Window

The Milgard Ultra is a pultruded fiberglass exterior with an interior wood veneer, a constant force balance, and is available in a number of different glass packages such as SunCoat and SunCoatMAX. The .080" fiberglass frame is available in 4 interior color options that include white, brownstone, tan, and matte black. Exterior color options include white, hunter green, tan, brownstone, matte black, and cranberry. Explore Milgard window prices.

Consumers can choose from 4 different hardware options such as white, brushed chrome, clay, and dark bronze. The Milgard Ultra window can be ordered as a single or double hung, slider, casement, awning, picture, radius, bay and bow window.